Analog Devices Inc./Maxim Integrated MAX961ESA+

Overview

The MAX961ESA+ from Maxim Integrated is a single ultra-high-speed comparator with internal hysteresis, optimized for +3V or +5V single-supply operation. It features 4.5ns propagation delay (5mV overdrive), ±3.5mV input-referred hysteresis, and Beyond-the-Rails™ input range extending 100mV beyond VCC and GND - enabling direct sensing of signals crossing supply rails in GPS receivers and high-speed sampling circuits.

For engineers reviewing the MAX961ESA+ datasheet, MAX961ESA+ pinout, MAX961ESA+ application, or MAX961ESA+ equivalent, key selection criteria include latch-enable functionality, shutdown mode (270μA), TTL/CMOS-compatible complementary outputs, and SO-8 package compatibility with space-constrained portable systems requiring rail-to-rail input tolerance and sub-5ns timing precision.

Technical Context

The MAX961ESA+ employs a current-driven output stage delivering 4mA sink/source capability while maintaining VOH ≤ VCC − 0.52V and VOL ≥ 0.52V across temperature. Its internal 3.5mV hysteresis eliminates external feedback resistors and prevents oscillation near trip points in noisy threshold-detection environments.

It integrates a latch-enable (LE) input that places the comparator output into transparent mode when low and holds the last valid state when high, with guaranteed setup/hold times of 5ns and latch propagation delay of 10ns. Shutdown control (SHDN) disables the comparator core, reducing supply current to 270μA per comparator while placing outputs in high-impedance state.

Key Specifications

Pinout & Package

MAX961ESA+ is housed in an 8-pin SO (Small Outline) package with standard JEDEC MS-012AC footprint (package code S8-2). The device uses a surface-mount gull-wing lead form compatible with reflow soldering and automated assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed comparator applications.

Compared with MAX961ESA+, MAX961EUA+ offers identical performance in a smaller package but reduced thermal mass and higher assembly cost, while TLV3501CD omits latch and shutdown - simplifying design at the expense of feature flexibility in portable or synchronized systems.

Availability

MAX961ESA+ is available at Aetrix Electronics and suitable for GPS receivers, portable threshold detectors, high-speed sampling circuits, and industrial line receivers requiring stable component supply, long-term manufacturability, and RoHS-compliant sourcing.

Supply support for MAX961ESA+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) is a U.S.-based semiconductor company specializing in high-performance analog and mixed-signal ICs for industrial, communications, and consumer applications.

The MAX961ESA+ belongs to Maxim's ultra-high-speed comparator family designed specifically for single-supply, low-power, rail-exceeding signal conditioning in portable and timing-critical systems.

FAQ

What is the operating temperature range for MAX961ESA+?

The MAX961ESA+ is specified over the industrial temperature range of −40°C to +85°C. This rating applies to all E-grade devices including MAX961ESA+, ensuring reliable operation in embedded industrial controls, automotive body electronics, and outdoor portable equipment where ambient temperatures vary widely. The device undergoes 100% production testing at +25°C, with full-range specifications guaranteed by design characterization.

Does MAX961ESA+ support latch functionality, and how is it controlled?

Yes, MAX961ESA+ includes a latch-enable (LE) input that controls synchronous output storage. When LE is low, the comparator operates transparently; when LE is pulled high, the current output state is latched and held. Timing parameters - 5ns setup/hold time and 10ns latch propagation delay - are fully characterized and guaranteed across temperature. The LE input has high impedance and requires clean CMOS-level logic drive to avoid metastability.

Can MAX961ESA+ operate from a 3.3V supply, and what are its output voltage limits?

Yes, MAX961ESA+ operates from +2.7V to +5.5V, making it fully compatible with 3.3V systems. At VCC = 3.3V, the outputs guarantee VOH ≥ 2.78V (VCC − 0.52V) and VOL ≤ 0.52V when sinking or sourcing 4mA. This ensures robust TTL/CMOS logic interfacing without external level shifters or pull-up resistors, preserving signal integrity in mixed-voltage digital subsystems.

How does the Beyond-the-Rails™ input feature work in MAX961ESA+?

The Beyond-the-Rails™ input structure in MAX961ESA+ allows either IN+ or IN− to be driven from −0.1V to VCC + 0.1V independent of the other input's voltage. This is achieved via internal protection diodes and resistor networks that clamp differential stress while preserving linear operation. As long as one input remains within the common-mode range, the comparator delivers correct logic output - enabling direct interface to sensors or signals exceeding supply rails without external biasing.

What is the shutdown behavior of MAX961ESA+, and how quickly does it recover?

When SHDN is driven high, MAX961ESA+ enters shutdown mode, reducing supply current to 270μA per comparator and placing outputs in high-impedance state. Recovery requires SHDN to return low *and* LE to be low (transparent mode); shutdown disable time (tON) is 250ns maximum, after which valid output transitions resume. This sequence prevents indeterminate states during power-up or mode switching in battery-gated systems.